Networking Glossary
- encapsulation The technique used by layered protocols in which a layer adds header information to the protocol data unit (PDU) from the layer above. As an example, in Internet terminology, a packet would contain a header from the physical layer, followed by a header from the network layer (IP), followed by a header from the transport layer (TCP), followed by the application protocol data. [Source: RFC 1208]
- end system An OSI system which contains application processes capable of communicating through all seven layers of OSI protocols. Equivalent to Internet host. [Source: RFC 1208]
- ES-IS (End system to Intermediate system protocol) The OSI protocol by which end systems announce themselves to intermediate systems. [Source: RFC 1208]
- entity OSI terminology for a layer protocol machine. An entity within a layer performs the functions of the layer within a single computer system, accessing the layer entity below and providing services to the layer entity above at local service access points. [Source: RFC 1208]
- EUnet European UNIX Network. [Source: RFC 1208]
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